MicroPython Forum (Archive)

Usually the full colour OLED screen have been quite expensive but I now see the screens used in smart watches are now selling fairly cheap.

1.3" colour OLED 240x240 res https://www.aliexpress.com/item/1-3-inc ... 44276.html

That is remarkably cheap. Someone would need to write a driver for the ST7789.

Existing colour OLED drivers are for the Adafruit displays which use SSD1331 and SSD1351 chips.

That is not an OLED, it's a regular TFT, the same as https://www.adafruit.com/product/3787

D'oh. So it is!

I have ordered 1 to find out.

I originally stumbled upon it when shopping for a smart watches and fit watches. Although most of the cheap ones use TFTs the slightly more expensive ones use OLED screens so I started to google them and found a number of manufactures making these see https://www.youtube.com/watch?v=zxhwS_i_osM

Ok now searching a bit more they r a IPS screen see http://nauticomp.com/tft-vs-ips-display ... ifference/ still much better than traditional TFT

As for a driver I was first going to see if I can drive it using Lobo display module just with a custom setup the same as I do with the ST7735 displays I have.

Chinese sellers often writes nonsense descriptions "IPS HD TFT ... LCD OLED Display" intentionally, to be found by search engines...

Given the above bold text I'd say the probability of it being LCD is 75%. On the basis of cost I'd give it 95%.

I have it, it's a TFT. An OLED display of this resolution (and color!) would need much more electronics on the back to generate by the high voltage necessary to drive a whole row of LEDs. While the low-resolution mono OLEDs get away with a simple charge pump, and only need external capacitors, something like this would definitely need an inductor for the boost converter, and that is a relatively big and characteristically looking part

Color OLED modules with resolution 128x128, 1.5" are available for ~15 US$ (except at Adafruit, where it costs 2x more).
The controler is SSD1351, as far as I know, only SPI interface is available.
Back side usually looks something like this:

pythoncoder wrote: ↑

Thu Nov 15, 2018 8:04 am

That is remarkably cheap. Someone would need to write a driver for the ST7789.

Existing colour OLED drivers are for the Adafruit displays which use SSD1331 and SSD1351 chips.

It is an IPS screen.

IPS vs traditional TFT

IPS: Stable and Much Quicker Response Times, Wide Viewing Angles, High Transmittance(1 millisecond vs. 25 milliseconds), Better Color Reproduction and Representation and slightly lower power consupmtion.

So although not a OLED the price/DPI/image-quaity ratio is very good.

I have ordered 1 and will compare it to the 1.44" ST7735 TFT that I have as the price on both r nearly the same.

this one https://www.aliexpress.com/item/7PIN-7P ... ffbd0b9d7d vs this one https://www.aliexpress.com/item/1-3-inc ... 44276.html